[Biff]

Out arm extension mech last year used the same basic system as the one just above, continuous cable, FP motor (one with gear box) with it's plastic hub as the cable drums, we used three total plastic hubs from the kit of parts as the cable drums, we also linked a window motor to the 1/2 inch shaft for the hold when not powered. The free speed ratio last year worked out to 1.4:1 this year the free speed at 12.2 volts on a FP and gear box is 144,(last year it was 130) free speed of the Nippon window motor is about 78 to 80 not the published 75 this is at full battery voltage. 12.2 to 12.4, You windup putting the larger sprocket on the window motor to match the shaft speed of the FP. (Removed clip, remove geared hub from window motor, weld thick washer to drive teeth, drill and tap 4 or so holes through washer bolt flat #35 sprocket to washer with #8 or #10 button top cap screws, watch out for chain clearances. Put back together.) I would not recommend running the FP at or near stall at 12 volts, we let the smoke out of two last year. Also the window motor takes load well as long as the hold direction pushes the driving worm away from the motor, load to much or shock it the other direction and you will kill it. This set up moved a three section arm at a good clip, collapsed to extended in about 3 to 5 seconds, we had a lot of sliding friction. Section length was approx 38 inches. This was able to lift the bot onto the bar and hang with out power at the Kettering Kick off.